Yep. If you are going to be basing your claim on your own personal anecdote, then that data is as subject to scrutiny and criticism as any other form of data.
Further, he is using his personal story to argue for a specific range of treatment programmes (am I being fair, I suspect I am as though he does not always name programmes himself, he does lend his support to individuals and articles/events that do), none of which he actually undertook.
If he believes that his running and scuba diving in the Bahamas was part of his ‘cure’, he still needs to justify how that can be generalised as evidence for formal GET under an ME/CFS or Long Covid service in the East Midlands say, also if his belief that he could will his own recovery arose from a St Paul on the road to Damascus moment through a phone conversation to a Lightening Process practitioner in Norway, he needs to explain how that can be generalised to believing others should undertake formal CBT or attend an LP course in down town Michigan, none of which he has experienced.
From the start his ‘illness’ was played out in social media, as a grand tragedy where ME/CFS was destroying his life, but as far as we can tell this was a self diagnosis. After having had the initial revelation of the possibility of PEM, he first lauded the online ME/CFS as a super support. Whilst supposedly pacing he was simultaneously ramping up military style training till believed he was better, then turned on that same online community as harmful for blocking his recovery by supposedly believing such individual recovery was impossible. This may tell us more about his own psychological state, his own saviour complex, than anything extant in the real world. He needs to explain how he is different to any of the many quack snake oil salesmen using a personal story to market their treatment programmes. If the evil ME/CFS community is supposedly preventing thousands if not millions from recovering by spreading false information, how is it that he was different to all the others.
For an Professor who is a retired consultant in Public Health he seems to miss the whole point of what constitutes evidence in medicine.
All he can say is that he recovered from some form of Long Covid, using the term in its loosest sense, but given he was self diagnosed and the data he presents is personal anecdote rather than a documented case study, we do not even know with certainty if would have met the formal diagnostic criteria for ME/CFS or ME type Long Covid. He believes his recovery came from a personal realisation that he could recover by force of will, but uses nothing but anecdote to justify this or explain how he is not either one of the many who spontaneously recover from simple post viral fatigue or one of the very few (the 6%?) who epidemiological studies report spontaneously recovering from ME/CFS.